class_docstr: Helper to grab a series of screenshots from the current Canvas-like object.
code: def cleanup(self):
      from PyQt5.QtWidgets import QApplication
  
      for child_widget in QApplication.allWidgets():
          if hasattr(child_widget, "close"):
              child_widget.close()
      QApplication.processEvents()
  
imports: from __future__ import annotations
  import os
  import time
  import shutil
  from vispy.io import imsave
  from vispy.gloo.util import _screenshot
  from vispy.scene import SceneCanvas
  from sphinx_gallery.scrapers import optipng, figure_rst
label_desc: Use image node_id 2 for calling the FrameGrabber obj's underlying member method code with example usage: obj.cleanup() without return types